Antistatic polymers including divalent segments represented by formula a) wherein R.sup.1 represents hydrogen or methyl, R.sup.2 represents an alkylene group having from 1 to 10 carbon atoms, R.sup.3 and R.sup.4 independently represent alkyl groups having from 1 to 4 carbon atoms, and X represents a halogen. Methods of making antistatic polymers and uses thereof as PSAs are also disclosed. a)

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A water-absorbent copolymer may include a vinyl alcohol constituent unit x and a constituent unit z other than the vinyl alcohol constituent unit x and a vinyl ester constituent unit y, wherein a ratio of a content of an average sequence of the constituent unit z to a content of the constituent unit z is 50.0 mol % or less.

A water-absorbent copolymer may include a vinyl alcohol constituent unit x and a constituent unit z other than the vinyl alcohol constituent unit x and a vinyl ester constituent unit y, wherein a ratio of a content of an average sequence of the constituent unit z to a content of the constituent unit z is 50.0 mol % or less.

The present invention provides a catalyst for an addition reaction of alkylene oxide, the catalyst comprises a nanocomposite ion-exchange resin having a structural formula of P-Im.sup.+-M.sup.−, wherein P is a nanocomposite resin matrix, Im.sup.+ is a cation derived from 5-6 membered heterocycle containing at least one nitrogen atom such as imidazolium cation, pyrazolium cation, pyrrolidinium cation, piperidinium cation, piperazinium cation, pyrimidinium cation, pyrazinium cation, pyridazinium cation, triazinium cation, and M.sup.− is an anion. The catalyst of the present invention can be used in the addition reaction of alkylene oxide and carbon dioxide. The catalyst has high wear resistance, high swelling resistance, and high activity. The products after the reaction are easy to separate, and the catalyst can be used continuously many times.

The present invention provides a catalyst for an addition reaction of alkylene oxide, the catalyst comprises a nanocomposite ion-exchange resin having a structural formula of P-Im.sup.+-M.sup.−, wherein P is a nanocomposite resin matrix, Im.sup.+ is a cation derived from 5-6 membered heterocycle containing at least one nitrogen atom such as imidazolium cation, pyrazolium cation, pyrrolidinium cation, piperidinium cation, piperazinium cation, pyrimidinium cation, pyrazinium cation, pyridazinium cation, triazinium cation, and M.sup.− is an anion. The catalyst of the present invention can be used in the addition reaction of alkylene oxide and carbon dioxide. The catalyst has high wear resistance, high swelling resistance, and high activity. The products after the reaction are easy to separate, and the catalyst can be used continuously many times.

Multi-block isoporous structures for non-aqueous and/or harsh chemical media having at least one of high separation specificity, chemical resistance, and antifouling properties, methods of manufacturing and use, for replacements or alternatives to existing separation membrane technologies.

Multi-block isoporous structures for non-aqueous and/or harsh chemical media having at least one of high separation specificity, chemical resistance, and antifouling properties, methods of manufacturing and use, for replacements or alternatives to existing separation membrane technologies.

The disclosure provides small molecule compounds, polymers, and compositions thereof, as well as methods for preparing such polymers and compositions. Also provided is a method of using the polymers or compositions thereof for binding uric acid or precursor thereof, and/or for treating hyperuricemia, gout, and/or diseases caused by hyperuricemia.

The disclosure provides small molecule compounds, polymers, and compositions thereof, as well as methods for preparing such polymers and compositions. Also provided is a method of using the polymers or compositions thereof for binding uric acid or precursor thereof, and/or for treating hyperuricemia, gout, and/or diseases caused by hyperuricemia.

A quaternary ammonium group-grafted cation resin and a preparation method thereof are provided. The preparation method includes: adding a chloromethylated cross-linked polystyrene (PS) resin, trimethylamine hydrochloride, and a 20% sodium hydroxide aqueous solution successively to a reactor for a reaction under stirring at 30° C. to 40° C.; filtering a resulting reaction solution, followed by washing and drying to obtain a quaternary ammonium group-grafted resin; adding the quaternary ammonium group-grafted resin, 1,2-dichloroethane, silver sulfate, concentrated sulfuric acid, and fuming sulfuric acid successively for a reaction for 1 hour at 50° C. to 60° C., a reaction for 1 hour at 70° C. to 80° C., and a reaction for 5 hours at 115° C. to 125° C.; and cooling a resulting reaction solution to room temperature, followed by diluting, filtering, washing and drying to obtain the quaternary ammonium group-grafted cation resin.